Calling python function from MATLAB when using python Tkinter results in "TclError: Can't find a usable init.tcl in the following directories"

I am trying to call a python function in a script with Tkinter from MATLAB.

I am able to send data from python to MATLAB using the matlab engine, and I can call python functions in MATLAB when the python file does not use a Tkinter gui. I only run into the issue when I am trying to call a function in a file that has a gui.

The error output I recieve:

Error using __init__ (line 2023)
Python Error: TclError: Can't find a usable init.tcl in the following directories:
    C:/Users/TS4804/AppData/Local/Programs/Python/Python37/lib/tcl8.6 {C:/Program Files/MATLAB/R2020a/bin/lib/tcl8.6} {C:/Program Files/MATLAB/R2020a/lib/tcl8.6} {C:/Program Files/MATLAB/R2020a/bin/library} {C:/Program Files/MATLAB/R2020a/library} {C:/Program Files/MATLAB/R2020a/tcl8.6.9/library} {C:/Program Files/MATLAB/tcl8.6.9/library}
This probably means that Tcl wasn't installed properly.

Error in test_gui><module> (line 22)

Error in <frozen importlib>_call_with_frames_removed (line 219)

Error in <frozen importlib>exec_module (line 728)

Error in <frozen importlib>_load_unlocked (line 677)

Error in <frozen importlib>_find_and_load_unlocked (line 967)

Error in <frozen importlib>_find_and_load (line 983)

Error in <frozen importlib>_gcd_import (line 1006)

Error in __init__>import_module (line 127)

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\TS4804\AppData\Local\Programs\Python\Python37\lib\tkinter\__init__.py", line 1705, in __call__
    return self.func(*args)
  File "test_gui.py", line 62, in send_to_matlab
    print(eng.pythonInterface(1, list_to_send))
  File "C:\Users\TS4804\AppData\Local\Programs\Python\Python37\lib\site-packages\matlab\engine\matlabengine.py", line 71, in __call__
    _stderr, feval=True).result()
  File "C:\Users\TS4804\AppData\Local\Programs\Python\Python37\lib\site-packages\matlab\engine\futureresult.py", line 67, in result
    return self.__future.result(timeout)
  File "C:\Users\TS4804\AppData\Local\Programs\Python\Python37\lib\site-packages\matlab\engine\fevalfuture.py", line 82, in result
    self._result = pythonengine.getFEvalResult(self._future,self._nargout, None, out=self._out, err=self._err)
matlab.engine.MatlabExecutionError: Python Error: TclError: Can't find a usable init.tcl in the following directories:
    C:/Users/TS4804/AppData/Local/Programs/Python/Python37/lib/tcl8.6 {C:/Program Files/MATLAB/R2020a/bin/lib/tcl8.6} {C:/Program Files/MATLAB/R2020a/lib/tcl8.6} {C:/Program Files/MATLAB/R2020a/bin/library} {C:/Program Files/MATLAB/R2020a/library} {C:/Program Files/MATLAB/R2020a/tcl8.6.9/library} {C:/Program Files/MATLAB/tcl8.6.9/library}



This probably means that Tcl wasn't installed properly.

As far as I can tell, because the GUI is running properly without MATLAB TCL is properly downloaded. It also comes built in for recent python installations. I have also tried to fix it by downloading the tcl files from activestate and added the paths of the files to matlab.

I am using:

MATLAB R2020a, python 3.7.7

Any help would be greatly appreciated

Answer 1

[Tom Sloan]

Figured it out, I had downloaded the wrong tcl library x.x.10 instead of x.x.9

Answer 2

[choi]

Hi.

Here is a example

======

pyExec = 'C:\Users\djchoi\AppData\Local\Programs\Python\Python37\pythonw.exe';

pyversion(pyExec);

pyStr = pyenv;

pyTCL = fullfile(pyStr.Home, 'tcl', 'tcl8.6');

pyTK = fullfile(pyStr.Home, 'tcl', 'tk8.6');

setenv('TCL_LIBRARY', pyTCL);

setenv('TK_LIBRARY', pyTK);

win = py.tkinter.Tk();

win.title('My GUI');

win.mainloop();

clear win